installer67

iTrader: (18)

Now you need to remove the top plate and use the depth gauge part of the caliper.

NOW ITS VERY IMPORTANT TO DO AS I SAY!

Fuel level setting is VERY IMPORTANT AND IS 27mm from the top face of the carb body down to the fuel.

Pump is off, if not turn it off!!! Wait for a minute for pressure to fall BEFORE removing the carburettor top.

Work on one carb at once.

If the fuel lines are not flexible it may help to remove them from the carb you are working on.

Put your one hand spanning the top of the carburettor top, float cover and put on some decent downward force with your fingers at each corner. Now undo the two screws...Remove them. Drop the screwdriver and quickly (under 1second) whip off the float cover/carburettor top and move it to oneside.

You need to do this quickly before the float drops and more fuel is dribbled into the bowl when you raise the top away from the body.

You now have the fuel exposed.

(see caliperuse)

Get the depth caliper in position as shown below. About 3mm off the wall of the central tower, at the back of the jet stack...Not at the edge or running down the wall as the liquid will radius here, but slightly away from the jet stack. The tip of the depth measure should just make contact with the fuel.

If its too high and the tip is well into the liquid, maybe use the container the valve came in to bail out some fuel, a good amount. (wear gloves! Yuck!). If too low, read on.

(see fuelbail)

Below shows an unadjusted float.

(see floatbend)

Fuel level too low, tweak up the end of the float, as shown below. (this is a dramatisation! Do not tweak as much as this!!!) a millimetre or 0.040" at time. If the bowl is 2mm low, go up 2mm on the float!

(see floatbendup)

Fuel level too high and venturi leaks? Tweak it down as needed.

(see floatbenddown)

If you have brought VITON Valves I recommend ONLY using them. They can "plump" up a bit after being exposed to fuel for the first time, so leave them to soak in some fuel for alteast 1hr before fitting them and calibrating fuel levels.

I have some stock of OE spec Kits or http://www.dellorto.co.uk can supply.

You can do the above adjustment with the carb top on by removing the main jets and jet cover from the carburettor and sticking the depth probe down main jet stack hole, but its hard to see etc chances are you will need to make some adjustment and remove the top anyway.



Ebay KITS ARE JUNK. Bar some RCA Ricambi Kits...Its RCA or OE Dellorto or NOTHING!

Hope this helps demystifty something so simple!

installer67

iTrader: (18)

I should probably have posted this first, buy better late than never.
All information in this thread was gathered from various places on the web. IT IS NOT MINE. I am no guru of Dellorto's. I'm just a rotor head that likes the Dellorto carb, is an insomniac and wants to help the community. Use any information here at your own risk. I'm not responsible for anything that happens resulting from use of, or access to this information.
Thanks,
Ray

t_g_farrell

iTrader: (1)

Heres the pics of the e tubes from my RB Dell for ya. You can compare
them to what you have and see what new holes are needed. Theres two
pics of the hole patterns. Looks like the holes are the same on sides 1
and 3 and then sides 2 and 4 are the same. I think any new holes are
the same size as the either the large or small existing holes. Its just
extras placed in a couple of spots I think. I don't have non RB ones to
compare but I did look at that pic you had of the e tubes and it looks
very similiar to the no. 8 one in the pic.

Hope this helps you out some.

installer67

iTrader: (18)

Thank you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Very curious though. I have a brand new set of .8's from Dellorto in front of me for comparison, they are identical. Same amount of holes and same sizes. (far as I can tell) hmmmmm........... is it possible the etubes you have aren't original RB's?

t_g_farrell

iTrader: (1)

No thats not possible, I bought my Dell directly from RB brand spankin
new. Maybe the etube modifications is really just an urban myth.
Unless its the idl etubes that are different. I could pull those today and
post pics up if that helps.

installer67

iTrader: (18)

That would be great. I've seen those refered to as e-tubes as well. It would be nice to know if the extra holes ARE indeed a myth. It will kinda **** me off if it is though, as RB could have just said as much and put an end to it. I'll wait for your pics and see. Thanks again, this is extremely helpfull to me.

installer67

iTrader: (18)

Found this @ gofastnews dot com.

here is how to read your emusion tube.

Hold the tube upside down (M/jet up) The top of the emulsion tube now represents the top of the rpm range and the bottom end the bottom of the rpm range. Where there are holes the mixture will be leaner. Where there are no holes it will be richer.
you should be able to home in on the right tube now really quickly.

DriveFast7

iTrader: (1)

I think the modified .8 e-tube is an urban myth. But, the idle jet holder is modified by RB. They drill a small hole in the top of the holder, making it an air bleed. That way they can use such large idle fuel jets (75+) and have the idle circuit bleed off. I've owned two RB carbs and both had the hole.

New idle jet holders don't have the hole in top. Hole is in the flat head groove on the very tip top.

Siraniko

iTrader: (13)

If you cant figure out a IDF and weber 45, how can you say that a dellorto is more tuneable.

installer67

iTrader: (18)

Wacky, touche'. However, I stand by my statement. It IS more tuneable, the sheer fact that it's got a much wider variety of jetting to choose from makes it so. That isn't the same as saying I have it tuned. I am a contractor, and have all the know how to build my own house from the ground up, but I have not done that either. LOL

installer67

iTrader: (18)

Drivefast7 - How large of a hole is in the top of the idle holder? Thanks for the info too! It does seem the elusive RB tubes are a myth. (which explains why they can't seem to be found)

Siraniko

iTrader: (13)

streetable maybe for some people but everything comes down to peformance. tuning wise, any carb will give you troubles if you dont have the "know-how." On weekends, I get free heines and korean bbq for fixing other other mechanic's mistakes (IDA to holleys and sideddrafts: mistuned, wrong jets etc etc).

installer67

iTrader: (18)

I follow you, but having more jets in smaller increments DOES make it a more tuneable carb, just not an EASIER to tune carb. Performance wise, your saying that being able to "fine" tune is not going to net you more performance? Just because the IDA has a better cfm rating and is capable of feeding more fuel, doesn't mean it's ALWAYS the best choice. IMO

Siraniko

iTrader: (13)

Based on your posts/threads, your opinion is just a guesstimate

installer67

iTrader: (18)

Yes, I'm sure you are right! But I figured if the guys that wrote the weber carb books I bought both agreed, who am I to argue. That and the couple websites I found that specialize in carburetors say the same as well. Maybe some of these guys are on the list of mechanics who's mistakes your always fixing! I just go with what the research and "proffesionals" say, I no carb guru, just a guy tryin to learn the rotary.

Keith13b

iTrader: (6)

This should be a sticky!

installer67

iTrader: (18)

For those of you like me, trying to setup your carb, or just trying to play with tuning it, here's a listing of the emulsion tubes for a Dellorto DHLA in order of leanest to richest.
the .3 and .4 will work in a dhla, but were designed for the dhlb. The (emission)tubes go .10, .8, .2, .1, .14, .5, .7, .6. (.5 is NLA) Standard engine tubes go .2, .1, .14. Modified or racing tubes are .5, .7, .6 . (info taken from Des Hamill's "How to build and power tune Weber and Dellorto dcoe,dco/sp and dhla carburetors" third edition.

Siraniko

iTrader: (13)

If dellorto is so great, why did they stop its production? parts wise, a weber is easier to find.

installer67

iTrader: (18)

Damn Wacky, your worse than my wife! Gotta find somethin to bitch about? So, your criteria of greatness is being produced forever and readilly available? That counts out 90% of the best cars and other things in the world. LOL Rx7s included. But if it makes you happy, think what you want. For an old school guy, you have some weird thinkin my man.

Siraniko

iTrader: (13)

coz I've tried them all carbs . trying to help people make the right decision on how to spend their hard earned cash. if you've listened to me from day one, your car would be running by now LOLLLLLLLLLLLLLLLLLLL

besides, i was just exactly just like you. trying out everything but at the end, they will just collect dust or they will become ornaments/garage decoration

AcidAngel7477

iTrader: (16)

what the hell wacky?! share the wealth...!! ill take that t2 mani with the looks like a weber deal. lol...

:AA:

installer67

iTrader: (18)

Wacky, I'm not trying to talk ANYONE into buying ANYTHING. I simply realise that like myself, there sre those out there that have, or are planning on buying a dellorto. So, knowing how difficult it can be to get actual helpful info on these carbs, I decided to make threads on the ones I'm "testing" with, or using. Giving those interested a single place to look and be able to find the answers or information on this carb that they may need. I have not and do not tell people to buy any specific carb. In fact I recomend that everyone looking to buy a carb do thier own independent research and decide for themselves what carb is right for them. BUT, you seem to only push the IDA's, which I feel is a bit one sided. Not everyone drives the same way, same speeds or even wants the same sort of performance from thier cars, so variety IS NECESSARY to meet demand. Not to mention that for a guy that just wants a bit more from his 7 than the stock carb offers, especially if he has a small budget, dropping 5-6 hundred on an IDA, then another 200 or better on the intake, plus jets etc. just plain isn't possible. I spent less than that on 3 carbs and intakes. All of which are plenty for me. My weber dcoe, even not in "ideal" tune, offers a better feel and performance than did my stock Nikki. As will the others I'm sure once I get to put them on and tune them. I don't need to be the fastest, just fast. I'm not a racer, just a guy like many that enjoys a well built sporty car, but needs to temper my "projects" according to my budget. If your personal experience with everything but IDA was bad, that's unfortunate, but maybe you should have considered your purchases better, according to what you wanted from your car. There are LOT'S of people on this forum that run carbs besides the IDA and are very happy with what they have. I fully intend to buy an IDA as well, but am not limiting my experience and enjoyment to what it has to offer. I build different cars for different purposes and styles. An IDA is not the ideal carb for mileage and commuting, or many other things. It is great for pure power and top end. Besides, how boring would it be if we all just ran the same carbs and setup as you want. I don't see you telling everyone to only buy or have built an old "mindtrain" style header, even though most everyone, yourself included I'm sure, knows it out performs most everything else. The same can be said for most parts. I'm just trying to help those who will benefit from the info I can find to share. Would you prefer I NOT try to help? Perhaps you should start a thread like this one or my dcoe thread and "educate" everyone on the IDA. (problem there is alot of the guys running those are racers and don't want everyone to know thier setups) Once I get my IDA and start that research, I'll be making one as well, but you are obviously an authority on them, so your insights and info would be first hand.

Siraniko

iTrader: (13)

I'm not preaching about an IDA. If you dont have any personal experience with it, then why recommend. Anticipate my posts as I like to question parroted knowledge

installer67

iTrader: (18)

If you were basing your statement on the thread your posting in.... this one, you'd see that I'm not even expressing an opinion, in fact I added a disclaimer to state that this info isn't mine at all, but what I've gathered on the net and books etc.

From what I've read, when the major manufacturers that Dellorto was supplying went to fuel injection etc. They made the decision to fold up "fiscally". I don't have the article on hand so I won't state this as fact until I find it again.

Once again, I'm providing information, not my personal recomendation. As to parroted knowledge, thats what text books are too. But they are still usefull tools and filled with helpful facts. It is you that is stating your opinions as facts. I'm happy to see people question "common knowledge" or anything else, but you aren't questioning, your assuming my intentions and injecting your "factual experience" relating to a different carb altogether, as well as questioning my personal integrity. I see no posts here of you stating anything of a constructive nature, or personal info about the Dellorto carbs. If you think they suck so bad, give us all the benefit of your wisdom and experience, so we can make a more informed decision. Saying you know better is just another "opinion". This thread is for the Dellorto carbs, not the IDA. Please help with information and actual constructive help, or start your own thread to say "I told you so", so that nobody has to read through this pissing match to get information. I will not apologise for trying to help, I haven't made recomendations, or stated false facts that I know of. I find it quite irritating that you can easilly take the time to bust my *****, but not to help out with knowledge you posess that could have helped. Only to say do this it's best, or I told you so. BTW- if I never actually get or try any other carbs, how is it I can ever speak about them from experience? And it is very presumptious of you to assume that YOUR experiences are the "only" or "right" ones. Making a choice that doesn't fall in line with your experiences, doesn't make it wrong or a waste of time etc. It just means I'm not you. I question and make up my own mind independently. I respect your experience, but not your tact in relaying it, or choosing me to be your example. I'm new here, and doing my best to research everything I can, question all I'm told, and help when ever possible. I donate my time, money and parts when I can to help others here. I don't make many recomendations, and when I do it's based on my personal experience and I say so. My dad is/was a "master mechanic" and raced with the "Old timers", pitted stock cars, made Hot Rod, taught mechanics as well as hydraulics as a proffessor, and had me tear down my first carb at 9. I'm not "unexperienced" or a weekend warrior. I have owned and built many hotrods, but I'm new to rotaries and try not to take anything I already know as applicable, so I ask alot of questions and try alot of things. Don't mistake my questioning as ignorance. I'm not 20, I do have a son nearly that age though. Experience is a tricky thing, nobodies is the same. Knowledge is power, share it or hoard it as you wish, I prefer to share.

Jibaro 12A

iTrader: (8)

I will vouch for Ray being top-notch! I can also see Wacky is a IDA lover. I prefer the IDA and Stripped Nikki's but I will say all this info I might consider a Dellorto in the future! Wacky your a old schooler and everyone here has alot of respect for you. Why not convey your knowledge and personal expierience. Its not just all about IDA's, Korean BBQ and Heinekens (which suck by the way but thats my OWN opinion!) This site is about a brotherhood of rotary lovers that are willing to help each other. Ray I agree with you 100% You did alot of research and took the time to share it with us. Thank You. I believe everyone will find success with different set-ups/ combos. Theres alot of variables that will make your carb performance vary. So its not just this carb is the ultimate or that one.